PoS - Proceedings of Science
Volume 334 - The 36th Annual International Symposium on Lattice Field Theory (LATTICE2018) - Theoretical Developments
Gaussian states for the variational study of (1+1)-dimensional lattice gauge models
P. Sala, T. Shi, S. Kuehn,* M.C. Banuls, E. Demler, J.I. Cirac
*corresponding author
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Published on: May 29, 2019
Abstract
We introduce a variational ansatz based on Gaussian states for (1+1)-dimensional lattice gauge models. To this end we identify a set of unitary transformations which decouple the gauge degrees of freedom from the matter fields. Using our ansatz, we study static aspects as well as real-time dynamics of string breaking in two (1+1)-dimensional theories, namely QED and two-color QCD. We show that our ansatz captures the relevant features and is in excellent agreement with data from numerical calculations with tensor networks.
DOI: https://doi.org/10.22323/1.334.0230
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